P1602 OBD Code Definition:
P1602 Control Module Self Test, Control Module Defective
P1602 OBD Code Description:

Possible Causes

  • Cables on the Battery were removed
  • Battery weak (voltage)
  • Generator Disfunction

Possible Solutions

  • Check Battery Cables
  • Check/Replace Battery
  • Check/Replace Generator

Tech Notes

  • If multiple Control Module have Power Supply Faults stored, it’s most likely to be one common Problem like the ones shown above. Otherwise when only one or two Control Modules have such Codes stored you better start searching at the individual Power Supply of these Modules.
  • Terminal 30 means unswitched battery power that is supplied even when the ignition is off. This is not referring to any physical terminal numbered 30.


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